SAM CLI Refresh 🎉: sam init, Better validation, Tons of bug fixes, and 🐍

.coveragerc

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+[run]
+branch = True
+[report]
+exclude_lines =
+    pragma: no cover
+    raise NotImplementedError.*

.flake8

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+[flake8]
+max-line-length = 120
+ignore = E126
+exclude = samcli/local/init/templates

.github/ISSUE_TEMPLATE.md

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+<!--
+
+Before reporting a new issue, make sure we don't have any duplicates already open or closed by
+searching the issues list. If there is a duplicate, re-open or add a comment to the
+existing issue instead of creating a new one. If you are reporting a bug,
+make sure to include relevant information asked below to help with debugging.
+
+## GENERAL HELP QUESTIONS ##
+Github Issues is for bug reports and feature requests. If you have general support
+questions, the following locations are a good place:
+
+- Slack channel (#samdev): https://awssamopensource.splashthat.com/
+- Post a question in StackOverflow  with "aws-sam-cli" tag
+
+-->
+
+**Description:**
+
+<!-- Briefly describe the problem you are facing -->
+
+**Steps to reproduce the issue:**
+1.
+2.
+3.
+
+**Observed result:**
+
+**Expected result:**
+
+**Additional environment details (Ex: Windows, Mac, Amazon Linux etc)**
+
+**Output of `sam --version`**:
+
+**Optional Debug logs**:
+
+`Add --debug flag to command you are running`